"""
简化的视频服务
Simplified Video Service
"""
import logging
import asyncio
from typing import Dict, Any, Optional, AsyncGenerator, List
import io

logger = logging.getLogger(__name__)


class VideoService:
    """简化的视频服务"""
    
    def __init__(self):
        self.active_streams = {}
        self.recordings = {}
    
    async def get_video_stream(self, camera_id: str, format: str = "flv", quality: str = "high") -> AsyncGenerator[bytes, None]:
        """获取视频流生成器"""
        try:
            # 简化实现 - 生成模拟视频流数据
            logger.info(f"开始视频流: {camera_id}, 格式: {format}, 质量: {quality}")
            
            # 模拟视频流数据
            frame_count = 0
            while True:
                # 生成模拟帧数据
                frame_data = self._generate_mock_frame(camera_id, frame_count, format)
                yield frame_data
                
                frame_count += 1
                await asyncio.sleep(0.04)  # 25fps
                
                # 检查流是否应该停止
                if camera_id not in self.active_streams:
                    break
                    
        except Exception as e:
            logger.error(f"视频流异常: {e}")
            raise
    
    async def get_stream_info(self, camera_id: str) -> Dict[str, Any]:
        """获取视频流信息"""
        try:
            return {
                "camera_id": camera_id,
                "status": "active" if camera_id in self.active_streams else "inactive",
                "format": "flv",
                "resolution": "1920x1080",
                "fps": 25,
                "bitrate": "2000kbps"
            }
        except Exception as e:
            logger.error(f"获取视频流信息失败: {e}")
            raise
    
    async def start_stream(self, camera_id: str) -> bool:
        """启动视频流"""
        try:
            self.active_streams[camera_id] = {
                "start_time": asyncio.get_event_loop().time(),
                "status": "active"
            }
            logger.info(f"视频流启动成功: {camera_id}")
            return True
        except Exception as e:
            logger.error(f"启动视频流失败: {e}")
            return False
    
    async def stop_stream(self, camera_id: str) -> bool:
        """停止视频流"""
        try:
            if camera_id in self.active_streams:
                del self.active_streams[camera_id]
            logger.info(f"视频流停止成功: {camera_id}")
            return True
        except Exception as e:
            logger.error(f"停止视频流失败: {e}")
            return False
    
    async def get_snapshot(self, camera_id: str) -> Optional[bytes]:
        """获取视频快照"""
        try:
            # 生成模拟快照数据
            snapshot_data = self._generate_mock_snapshot(camera_id)
            return snapshot_data
        except Exception as e:
            logger.error(f"获取快照失败: {e}")
            return None
    
    async def start_recording(self, camera_id: str, duration: int) -> Optional[str]:
        """开始录制"""
        try:
            record_id = f"rec_{camera_id}_{int(asyncio.get_event_loop().time())}"
            self.recordings[record_id] = {
                "camera_id": camera_id,
                "start_time": asyncio.get_event_loop().time(),
                "duration": duration,
                "status": "recording"
            }
            logger.info(f"录制开始: {record_id}")
            return record_id
        except Exception as e:
            logger.error(f"开始录制失败: {e}")
            return None
    
    async def stop_recording(self, camera_id: str) -> Optional[Dict[str, Any]]:
        """停止录制"""
        try:
            # 查找活动录制
            for record_id, record_info in self.recordings.items():
                if record_info["camera_id"] == camera_id and record_info["status"] == "recording":
                    record_info["status"] = "completed"
                    record_info["end_time"] = asyncio.get_event_loop().time()
                    
                    return {
                        "record_id": record_id,
                        "camera_id": camera_id,
                        "duration": record_info["end_time"] - record_info["start_time"],
                        "file_size": "100MB"  # 模拟文件大小
                    }
            return None
        except Exception as e:
            logger.error(f"停止录制失败: {e}")
            return None
    
    async def get_recordings(self, camera_id: str, limit: int = 50, days: int = 7) -> List[Dict[str, Any]]:
        """获取录制列表"""
        try:
            recordings = []
            for record_id, record_info in self.recordings.items():
                if record_info["camera_id"] == camera_id:
                    recordings.append({
                        "record_id": record_id,
                        "camera_id": camera_id,
                        "start_time": record_info["start_time"],
                        "duration": record_info.get("duration", 0),
                        "status": record_info["status"],
                        "file_size": "100MB"
                    })
            
            return recordings[:limit]
        except Exception as e:
            logger.error(f"获取录制列表失败: {e}")
            raise
    
    async def get_playback_stream(self, record_id: str) -> Optional[AsyncGenerator[bytes, None]]:
        """获取回放流"""
        try:
            if record_id not in self.recordings:
                return None
            
            # 生成模拟回放流
            async def playback_generator():
                for i in range(100):  # 模拟100帧
                    frame_data = self._generate_mock_frame(record_id, i, "mp4")
                    yield frame_data
                    await asyncio.sleep(0.04)
            
            return playback_generator()
        except Exception as e:
            logger.error(f"获取回放流失败: {e}")
            return None
    
    def _generate_mock_frame(self, camera_id: str, frame_count: int, format: str) -> bytes:
        """生成模拟视频帧数据"""
        # 简单的模拟数据
        mock_data = f"FRAME_{camera_id}_{frame_count}_{format}".encode('utf-8')
        return mock_data.ljust(1024, b'\x00')  # 填充到1KB
    
    def _generate_mock_snapshot(self, camera_id: str) -> bytes:
        """生成模拟快照数据"""
        # 简单的模拟JPEG头和数据
        jpeg_header = b'\xff\xd8\xff\xe0\x00\x10JFIF'
        mock_data = f"SNAPSHOT_{camera_id}".encode('utf-8')
        jpeg_footer = b'\xff\xd9'
        
        return jpeg_header + mock_data.ljust(1000, b'\x00') + jpeg_footer